簡單示例用法

let messageBox:MessageBox = MessageBox()

// set
messageBox.setObject("TestObject1", forKey:"TestKey1")

// get
// but don't remove it, keep it stored, so that it can still be retrieved later
let someObject:String = messageBox.getObject(forKey:"TestKey1", removeIfFound:false)

// get
// and remove it
let someObject:String = messageBox.getObject(forKey:"TestKey1", removeIfFound:true)